[masraum]

This is probably 30 years old. I read it in a car magazine back in the day. It was a story as told by a professional car thief that eventually got caught. He only stole corvettes. The two tactics that I remember were:

He'd go to folks that were selling cars and act like a potential buyer. Sellers are all too happy to show you all of the tricks and secrets of alarms, kill switches, etc... on car when they are trying to sell you a car. So they'd essentially show the guy how to steal their car.

Another tactic if it was an alarm that he didn't know how to get around, he'd go to the house every night between 1 and 5 am and jostle the car to make the alarm go off. After enough nights of that happening, they eventually turn the alarm off.